Tandem draft-rigging.



G. L. HARVEY.

TANDEM DRAFT RIGGING.

' APPLICATION FILED APR. I7. IQIII.

Patented Feb. 1S, 1919 2 SHEETS-SHEET l.

`|III IiIIIIIII IIIII IIIIIIIIL li. L` HARVEY. TANDEM DRAFT RI'GGING.` APPLICATION FILED'APR. 1i. ms.

Patented Feb. 1S, 1919,

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*nf yoke und u shmdnn draw bm: iq nm'- 'from of ifm-s3 spring nv-mbo?? 725; th m: y mmf- :1i mm wel ihn slot m the spring being; @paged `l mlm, ihn, kfngd of the slot ming: oqun in m2 @m1, m51 an@ d, me mh) over a. projection 26, held on the front follower, its rear end 27, being enlarged to substantii'xlly the size of the spring 20, and being adapted to transmit motion thereto. The flared end 27, fits within a` similarly shaped aperture in the plate 24. In order to prevent the turning of the plunger I flatten one side thereof, as best shown at 28, (in Fig. 3) and the aperture 29, in the plate 24, is similarly shaped. The reason for preventing the plunger from turning is that the forward end 30, thereof (as best shown in Figs. l and 6) is rounded slightly in a horizontal direction to accommodate the necessary cant ing of the front follower following the oscillation ofthe draw bar. The result might be secured by roundin the end of the plunger as in a sphere, but t ie area of contact would be less than when rounded as here shown; therefore it is desirable to prevent the plun ger from moving to a position where the curvature would be ineffective. It will be noted that a space separates the enlarged end 27, of the plunger and the rear spring 20. This is done in order that the springs may successively come into action both on pull and buil'. I am aware that this in itself is not new, but in a construction such as herein disclosed it is novel and useful.

The end or head 27, of the plunger, which is seated in the countersunk opening in the plate 24, terminates in the plane of the forward end of the pocket formed by the walls 19. Thus the plate.y the plunger, spring and the front follower 23, may be inserted in and removed from the yoke as a unit through the lateral opening therein. This," enables the parts to be readily removed. By

reason of the shape of the head 27, its extremity may be substantially the diameter of the spring contained within the pocket and its shank may be of such diameter as to be received within thc center of the forward spring 22.

It will be noted that the separating plate 24. does not at any time engage stops on the sills, and that this plate, together with the yoke and pocket are immovable on the buffing stroke. rOn the draft stroke the forward spring is first compressed and the rear spring then begins its duty. The yoke and associated parts move forward with the draw bar. The rigging is supported at its rear endy by a transvecse plate 31, in the usual manner.

The great and fundamental advantage in the use of a rigging such as described is that all the parts are adapted to be accommodated within the short space usuallyoccu*q pied by springs of small diameter and that notwithstanding this a tandem rigging is provided the same having cumulative travel with very large capacity springs. In order to ins" rt the gear between the sills the parts are a, .semblcd as shown and forced between the stops. The necessary initial compression is secured by driving the key 15, into position.

I claim:

l. In a draft rigging, the. combination of a yoke having an integral barrel in the rear end thereof, a pair of full size cushion cle-- ments, one of which is accommodated in said barrel, a plate extending across the open end ofthe barrel and serving,r as a bearing for the rear end of the forward cushion clement a front follower, a plunger extending from the follower through said plate and having a head adapted tobear on the forward end of the rear cushion element, and a draw bar slidably engaging said yoke, substantially as described.

In a draftrigging, the combination of a yoke having an integral barrel in the rear end thereof, a pair of full size cushion elements, one of which is accommodated in said barrel, a plate extending acrossl the open end of the barrel and serving as a bearing for the rear end of the forwardcushion element, a front follower, a plunger extending from the `follower through said plate and haring a head adapted to bear on the forward end of the rear cushion element, said plunger terminating in the plane of the forward edge of the barrel, whereby the plunger, plato and forward cushion clement may be inserted laterally, as a unit, in the forward opening in the yoke, and a draw-bar slid ably engaging said yoke, substantially as de il. In a draft rigging, the combination of a yoke having an integral barrel in the rear eniil thereof, a pair of full size cushion elements, one of which is accommodated in said barrel, a plate extending across the open end of the barrel and serving as a bearing for the rear end of the forward cushion element, a front follower, a plunger extending from the follower through said plate and having a head adapted to bear on the forward end of the rear cushion element, said head beingr countersunk-in the plate in order that the inner face of the head may lie substantially in the plane of the forward odge ol the barrel, and a drawbar slidably engaging said yoke, substantially as described.

4. In a draft rigging, the combination of a yoke having a barrel of a lengt-b equal to substantially one-half the s ring space in the yoke, a pair of cushion e emcnts, one of which is accommodated within said barrel, a plate overlying the open end of the barrel, said plate having a flared axial opening therein, the large diameter of the opening being substantially equal to the external diametei" of the cushion elements employed, the lsmall diameter of the. opening being sub-- stantially equal to the diameter of the inter nal opening in said cushion elements, a front follower, a phmger,abutting said follower i le 

